linux-kernel - [PATCH 02/15] PCI: mvebu: Check for errors from pci_bridge_emul

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Message-Id: <20211125124605.25915-3-pali@kernel.org>
Date:   Thu, 25 Nov 2021 13:45:52 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Marek Behún <kabel@...nel.org>
Cc:     linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 02/15] PCI: mvebu: Check for errors from pci_bridge_emul_init() call

Function pci_bridge_emul_init() may fail so correctly check for errors.

Signed-off-by: Pali Rohár <pali@...nel.org>
Fixes: 1f08673eef12 ("PCI: mvebu: Convert to PCI emulated bridge config space")
Cc: stable@...r.kernel.org
---
 drivers/pci/controller/pci-mvebu.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index d655c887ba1b..6197f7e7c317 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -581,7 +581,7 @@ static struct pci_bridge_emul_ops mvebu_pci_bridge_emul_ops = {
  * Initialize the configuration space of the PCI-to-PCI bridge
  * associated with the given PCIe interface.
  */
-static void mvebu_pci_bridge_emul_init(struct mvebu_pcie_port *port)
+static int mvebu_pci_bridge_emul_init(struct mvebu_pcie_port *port)
 {
 	struct pci_bridge_emul *bridge = &port->bridge;
 	u32 pcie_cap = mvebu_readl(port, PCIE_CAP_PCIEXP);
@@ -608,7 +608,7 @@ static void mvebu_pci_bridge_emul_init(struct mvebu_pcie_port *port)
 	bridge->data = port;
 	bridge->ops = &mvebu_pci_bridge_emul_ops;
 
-	pci_bridge_emul_init(bridge, PCI_BRIDGE_EMUL_NO_PREFETCHABLE_BAR);
+	return pci_bridge_emul_init(bridge, PCI_BRIDGE_EMUL_NO_PREFETCHABLE_BAR);
 }
 
 static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
@@ -1094,9 +1094,18 @@ static int mvebu_pcie_probe(struct platform_device *pdev)
 			continue;
 		}
 
+		ret = mvebu_pci_bridge_emul_init(port);
+		if (ret < 0) {
+			dev_err(dev, "%s: cannot init emulated bridge\n",
+				port->name);
+			devm_iounmap(dev, port->base);
+			port->base = NULL;
+			mvebu_pcie_powerdown(port);
+			continue;
+		}
+
 		mvebu_pcie_setup_hw(port);
 		mvebu_pcie_set_local_dev_nr(port, 1);
-		mvebu_pci_bridge_emul_init(port);
 	}
 
 	bridge->sysdata = pcie;
-- 
2.20.1